What is a polymer lithium-ion battery? What are the characteristics of polymer lithium-ion batteries?
Li-polymer battery (Li-polymer), also known as a polymer lithium-ion battery, is a chemical battery. Lithium polymer batteries have ultra-thin characteristics and can be made into batteries of different shapes and capacities to meet the needs of some products. The theoretical minimum thickness can reach 0.1mm.
Lithium polymer battery uses file alloy as the positive electrode, polymer conductive material, polyacetylene, polyaniline, polyp-phenol as the negative electrode, and an organic solvent as an electrolyte, the specific energy of lithium polyaniline battery can reach 350W.h/kg, But the extraordinary power is only 50-60W/kg, the operating temperature is -40-70 degrees, and the service life is about 330 times.
Compared with lithium-ion batteries, the characteristics of lithium polymer batteries are as follows:
- The battery leakage problem is relatively improved, but it has not been thoroughly improved.
- it can make it into a thin battery: with a 3.6V 250mAh, its thickness can be as light as 0.1mm.
- The battery can be designed into various shapes.
- it can make it into a single high voltage: the battery with liquid electrolyte can only obtain high voltage by connecting several batteries in series. In contrast, it can make the polymer battery into a multi-layer combination in a single cell to achieve high voltage because it has no liquid.
- The discharge capacity is theoretically 10% higher than that of a lithium-ion battery of the same size.
Lithium polymer batteries have many advantages such as high specific energy, miniaturization, ultra-thinness, lightweight, and increased safety. Based on these advantages, lithium polymer batteries can be made into batteries of any shape and capacity to meet various needs. And it uses aluminum-plastic packaging; it can immediately manifest internal problems through the outer packaging; even if there is a safety hazard, it will not explode but only bulge.
In the polymer battery, the electrolyte plays the dual function of the separator and the electrolyte: on the one hand, it separates the positive and harmful materials like a separator so that self-discharge and the short circuit does not occur inside the battery; on the other hand, it acts as a positive and negative electrolyte like the electrolyte—conduction of lithium ions between the electrodes. Polymer electrolytes have good electrical conductivity and have the characteristics of lightweight, good elasticity, and easy film formation that are unique to polymer materials.